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Looking to build up a spesh big hit 05 model got some rock shox psylos 130mm travel, would these mess up the geom on the bike or be ok?
Quick google suggests that an '05 big hit was meant for a 170mm fork.
So, yes, those psylos will knacker the geometry.
They are also a bit of a rubbish fork from the pre-SRAM rockshox bad old days. Much better around (even second hand) these days.
Dave
Ok cheers, looks like trying to find some 170mm forks. For cheap
Having owned a set years ago on a light XC bike, I really don't think you want those on a Big Hit. They're pretty flexy and prone to blowing seals.
I'd go for something a bit more substantial
Another no from me - I had a set and they were rubbish. Even the bolt through ones flexed like a flexy thing!
The geometry would be screwed up as well. There are loads of longish travel Marzocchi's on the bay and Pink Bike for sale. They may not be the most sophisticated things, but at least they'll be tough and won't make your bike handle badly.
Something like these zocchi 66s might work better:
http://singletrackmag.com/forum/topic/fs-turner-six-pack-marzocchi-66sl-fox-vanilla-rc-rear-shock-1
As alfabus said, I think you're barking up the wrong tree with Psylos on a Big Hit. Having said that, I have seen a fellow in london riding a Big Hit with a set of 100mm RST Gila forks that looked like they'd been liberated from a Spesh Hardrock. Yes, it did look ridiculous.
The Psylo wasn't Rockshox's finest hour. They have a problem with the plastic internals absorbing damping oil and swelling, making the suspension spike horribly. The only workaround is to drill out the valve to fit, which TF Tuned will do as part of a service. They weren't overly stiff or reliable either.
Even with a stiff spring they were rubbish.
My big hit felt much better when running bigger forks. It started life with Jr T's which were a popular choice but a bit poo. It latter gained a pair of Shivers which I really liked. The best money I ever spent on that bike was getting the the Vanilla TV push tuned; it worked better than the Demo 9 that replaced it.
look for a domain 318
domain 318 +1
doubt you'll do better for the price